physics
posted by jen .
You drop a ball from a height of 2.0 m and it bounces back to a height of 1.5 m (a) What fraction of its initial energy is lost during the bounce? (b) What is the ballâ€™s speed just at it leaves the ground after the bounce?

(a) 1/4
(b) sqrt(3/4)*sqrt(2gH)
where H = 2.0 m
You could also write it as sqrt(2gH'), where H' = 1.5 m is the distance it rises after the first bounce
Respond to this Question
Similar Questions

physics
You drop a ball from a height of 2.8 m, and it bounces back to a height of 1.0 m. (Ignore air resistance.) (a) What fraction of its initial energy is lost during the bounce? 
Physics
You drop a ball from a height of 2.0 m and it bounces back to a height of 1.5 m (a) What fraction of its initial energy is lost during the bounce? 
physics
a superball of mass .125 kg is dropped onto a concrete floor from a height of 1m it bounces back at a height of .9m. What is the net force acting on the ball before and after its released? 
physics
A ball is dropped from the initial height h1 above the concrete floor and rebounds to a height of equal to 67% of the initial height h1. What is the ratio of the speed of the ball right after the bounce to the speed of the ball just … 
physics
A ball is dropped from the initial height h1 above the concrete floor and rebounds to a height of equal to 60% of the initial height h1. What is the ratio of the speed of the ball right after the bounce to the speed of the ball just … 
physics
You drop a ball from a height of 1.9m , and it bounces back to a height of 1.3m . a)What fraction of its initial energy is lost during the bounce? 
PHYSICS
You drop a ball from a height of 2.8 m, and it bounces back to a height of 1.4 m. (Ignore air resistance.) (a) What fraction of its initial energy is lost during the bounce? 
physics
A superball is dropped from rest from a height of 2.0m. It bounces repeatedly from the floor, as superballs are prone to do. After each bounce the ball dissipates some energy, so eventually it comes to rest. The following pattern is … 
physics
A superball is dropped from rest from a height of 2.0m. It bounces repeatedly from the floor, as superballs are prone to do. After each bounce the ball dissipates some energy, so eventually it comes to rest. The following pattern is … 
5th grade math
On each bounce a ball reaches 4/5 of the height of its previous bounce.How high will the ball bounce on its 3rd bounce?